Blue Sea Systems
Marine circuit protection, fuse holders, battery switches, busbars, and electrical distribution components designed for dependable boat systems.
Blue Sea Systems develops dependable AC and DC electrical products for marine and specialized vehicle applications. The brand is known for practical solutions across circuit protection, power distribution, switching, and system monitoring. The Common Ground Marine selection currently focuses on Blue Sea Systems marine fuses and fuse holders, including ANL, MEGA, MAXI, Class T, and MRBF formats. Compare voltage, amperage, fuse style, and holder compatibility to protect the complete electrical circuit.
Products from Blue Sea Systems
206 products
Blue Sea SystemsBlue Sea Systems Terminal Block Jumper for 20A Terminal Blocks
Terminal block jumper for 20A terminal blocks (2400 Series). Bridges adjacent positions into a common circuit. Sold in a 5-piece retail pack.
SKU BLUE-9218B
$0.53MSRP $0.64
Blue Sea SystemsBlue Sea Systems Terminal Block Jumper for 30A Terminal Blocks
Terminal block jumper for 30A terminal blocks (2500 Series). Bridges adjacent positions into a common circuit. Sold in a 5-piece retail pack.
SKU BLUE-9217B
$0.53MSRP $0.64
Blue Sea SystemsBlue Sea Systems Terminal Block Jumper for 65A Terminal Blocks
Terminal block jumper for 65A terminal blocks (2600 Series). Bridges adjacent positions into a common circuit. Sold in a 5-piece retail pack.
SKU BLUE-9216B
$0.63MSRP $0.76
Blue Sea SystemsBlue Sea Systems e-Series Dual Circuit Plus Battery Switch
e-Series Dual Circuit Plus battery switch, 350A continuous, 32V DC maximum. Switch two isolated circuits together or combine the battery banks.
SKU BLUE-5511E
$56.70MSRP $68.04
Blue Sea SystemsBlue Sea Systems e-Series On-Off Battery Switch
e-Series single-circuit On-Off battery switch, 350A continuous, 48V DC maximum. Disconnects a single battery from one load group.
SKU BLUE-9003E
$42.00MSRP $50.40
Blue Sea SystemsBlue Sea Systems e-Series Selector 4 Position Battery Switch
e-Series 4-position selector battery switch, 325A continuous, 32V DC max. Switches isolated banks or combines them. No AFD — see PN 9002e for that feature.
SKU BLUE-9001E
$44.80MSRP $53.76
Blue Sea SystemsBlue Sea Systems m-Series Automatic Charging Relay - 12/24V DC 65A
m-Series Automatic Charging Relay - 12/24V DC 65A. Senses charging on two battery banks. Pull off and snap on insulating cover.
SKU BLUE-7601
$85.40MSRP $102.48
Blue Sea SystemsBlue Sea Systems m-Series Mini Dual Circuit Battery Switch
m-Series Mini dual circuit battery switch, 300A continuous rating per circuit, 32V DC maximum voltage. Simultaneously switches two isolated banks.
SKU BLUE-6010
$56.00MSRP $67.20
Blue Sea SystemsBlue Sea Systems m-Series Mini Dual Circuit Plus Battery Switch
m-Series Mini dual circuit plus battery switch, 300A continuous rating per circuit, 32V DC maximum voltage. Simultaneously switches two isolated banks or combines them.
SKU BLUE-6011
$46.20MSRP $55.44
Blue Sea SystemsBlue Sea Systems m-Series Mini On-Off Battery Switch with Key, Red
m-Series Mini single-circuit On-Off battery switch, 300A continuous, 48V DC maximum. Disconnects one battery to one load group. Ignition protected.
SKU BLUE-6005
$28.00MSRP $33.60
Blue Sea SystemsBlue Sea Systems m-Series Mini On-Off Battery Switch with Knob, Black
m-Series Mini single-circuit On-Off battery switch, 300A continuous, 48V DC maximum. Disconnects one battery to one load group. Ignition protected.
SKU BLUE-6006200
$33.60MSRP $40.32
Blue Sea SystemsBlue Sea Systems m-Series Mini On-Off Battery Switch with Knob, Red
m-Series Mini single-circuit On-Off battery switch, 300A continuous, 48V DC maximum. Disconnects one battery to one load group. Ignition protected.
SKU BLUE-6006
$28.00MSRP $33.60
Blue Sea SystemsBlue Sea Systems m-Series Mini Selector 4-Position Battery Switch
Red m-Series Mini 4-position selector battery switch, 300A continuous, 32V DC maximum. Choose either battery bank or combine both.
SKU BLUE-6007
$37.10MSRP $44.52
Blue Sea SystemsBlue Sea Systems m-Series Mini Selector 4-Position Battery Switch without AFD
m-Series Mini 4-position selector battery switch, 300A continuous rating, 32V DC maximum voltage. No AFD included. Switches isolated battery banks to all loads.
SKU BLUE-6007200
$44.80MSRP $53.76
Blue Sea SystemsBlue Sea Systems 12V DC USB 2.0 Extension with Cable
USB 2.0 data extension port, 5ft prewired cable, mounts in a 1-1/8in hole. Lets you control a stereo from the dash without climbing below. IP45 rated.
SKU BLUE-1044
$26.60MSRP $31.92
Blue Sea SystemsBlue Sea Systems AC Analog Voltmeter 0-150V
AC analog voltmeter, 0-150V AC display range, dial marked in 5V increments. Simple 2-wire connection to AC hot and neutral, backlit face reading.
SKU BLUE-9353
$38.50MSRP $46.20
Blue Sea SystemsBlue Sea Systems AMG® Fuse - 100 Amp
AMG® Fuse - 100 Amp. Most economical fuse for 100-300 Ampere circuit protection. For use with Blue Sea Systems' AMG® Fuse Block.
SKU BLUE-51101
$9.10MSRP $10.92
Blue Sea SystemsBlue Sea Systems ANL Fuse - 600 Amp
ANL Fuse - 600 Amp. Silver-plated connector blades for corrosion resistance. Visible indication of blown condition.
SKU BLUE-5161
$44.10MSRP $52.92
Blue Sea SystemsBlue Sea Systems ANL Fuse 80A 80V DC
80A ANL fuse for main DC circuit protection, 80V DC maximum, 6,000A interrupt capacity. Use with a Blue Sea ANL Fuse Block (sold separately).
SKU BLUE-5124
$23.10MSRP $27.72
Blue Sea SystemsBlue Sea Systems CableCap Black 1.25 to 0.70 Stud
Black PVC CableCap, insulates a single stud connector. Fits cable sizes 3/0, 4/0 AWG. For alternators, starters, windlasses, and similar high-amperage devices.
SKU BLUE-4015B
$2.35MSRP $2.82
Blue Sea SystemsBlue Sea Systems CableCap Red 0.50 Stud
Red PVC CableCap, insulates a single stud connector. Fits cable sizes 1, 2, 1/0, 2/0 AWG. For alternators, starters, windlasses, and similar high-amperage devices.
SKU BLUE-4012B
$2.15MSRP $2.58
Blue Sea SystemsBlue Sea Systems Common 150A BusBar 10 Gang
150A common busbar, 10 screw terminals plus 2 stud terminals, 300V AC / 48V DC max. The industry-standard busbar for positive or negative consolidation.
SKU BLUE-2301
$21.00MSRP $25.20
Blue Sea SystemsBlue Sea Systems Dual PowerPost One 5/16in and One 3/8in Stud
Dual PowerPost connector, One 5/16"-18 and one 3/8"-16 stud, 48V DC maximum. Two independent stud terminals on one mount, with one black and one red insulator included.
SKU BLUE-2018
$20.30MSRP $24.36
Blue Sea SystemsBlue Sea Systems Dual PowerPost Two 5/16in-18 Studs
Dual PowerPost connector, Two 5/16"-18 studs, 48V DC maximum. Two independent stud terminals on one mount, with one black and one red insulator included.
SKU BLUE-2016
$20.30MSRP $24.36
Choose the right Blue Sea Systems fuse
Start with system voltage, expected continuous current, conductor size, and the manufacturer's specified overcurrent protection. Then select the fuse family, amp rating, and a compatible holder or terminal block. Match the fuse to the holder and confirm the available interrupt rating and installation clearances.
Browse circuit protectionMarine circuit protection starts with the whole DC system
Blue Sea Systems offers several fuse formats for different installation and service requirements. Compare the electrical specification, physical format, and mating holder before ordering a replacement or building a new system.
- ANL, MEGA, MAXI, Class T, and MRBF fuse formats
- Fuse holders and terminal solutions for organized power distribution
- Guidance on voltage, amperage, conductor sizing, and compatibility
Frequently asked questions
What does Blue Sea Systems make?
Blue Sea Systems designs AC and DC electrical products for marine and specialized vehicle applications. The current selection includes marine fuses and a fuse holder for circuit protection and power distribution.
How do I choose a Blue Sea Systems marine fuse?
Confirm the system voltage, required amperage, conductor size, fuse type, holder compatibility, and the protection requirements specified by the equipment manufacturer. The fuse must be appropriate for the complete circuit, not just the load.
What is the difference between ANL, MEGA, MAXI, Class T, and MRBF fuses?
These are different fuse formats with different physical sizes, holders, ratings, and installation requirements. Use the product documentation and your system design to select the correct format and verify that the fuse and holder are a compatible pair.
Need a quote on Blue Sea Systems gear?
Tell us what you're building. Our team will spec the right kit for your install and send a written quote.
Why buy from us
We carry this brand because it earns its place on the boat.
Stocked for marine builds
We focus on parts that meet the conditions boats see — not just whatever ships fastest.
Engineering review on request
Send a parts list or a layout and we'll check it against your boat before you order.
Direct from our team
Pricing, availability, and product questions all go through the same people who build custom harnesses and panels.